I received the implant in October 2014 and a month after my period changed a bit. Instead of the normal bleeding it was dark brown and light. It stayed like that until last month (July 2015). I had protected sex then a week after I got my period. It was still the dark brown but this time there was some blood. That lasted five days but then five days later I got it again. Now it's been 2 weeks and now I have it again. Oh also I have been going to the gym lately and doing a lot of arm machines could have something have happened to the bar? It doesn't feel broke so could I be pregnant?